Bow-drill.



J. A. LELAND.

BOW DRI-LL.

APPLICATION FILED Dec. Ia. 1915.

Patented May 30,1916.

IVVENTOR By l II I .ZIM/7 mwy ATTORNEYS THE COLUMBIA PLANouAPH co., WASHNQTON, D. c.

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JOHN A. LELAND, OF MONTAGUE, MASSACHUSETTS, ASSIGNOR TO MILLERS- FALLS COMPANY, 0F MILLERS FALLS', MASSACHUSETTS, .A CORIPORATION OF MASSA- CHUSETTS.

BOW-DRILL.

Specication of Letters Patent.

Y rarement May so, inici.

Application led December 13, 1915. Serial No. 66,419.

To all whom t may concern:

Be it known that I, JOHN A. LELAND, a citizen of the United States, residing at Montague, in the county of Franklin and State of Massachusetts, have invented new and useful lmprovements invBow-Drills, of which the following is a specification.

This invention relates to so-calledbow drills adapted for the use of jewelers in drilling holes in relatively soft metal, such as copper, brass, silver, etc., the drilling bit being driven by a hand-operated reciprocating motor. Said motor in the elementary type of bow drill is a bow grasped by the operators hand and a string attached to the ends of the bow and wrapped around the bit spindle.

The invention has for its object to provide a drill the bit of which is both dirigible and rotatable by one hand of the workman, while the other hand is free to liold and control the work, the drill including a handoperated reciprocating motor which rotates the drilling bit in one direction only, a forward rotation being given to the hit` when the motor is moving in one direction, and the rotation being continued when the motor is moving in the opposite direction, so that the rotation of the bit is practically continuous.

r1`he invention is embodied in the improvements which l will now proceed to describe and claim.

Of the accompanying drawings forming a part of this specification: Figures 1 and 2 represent elevations of diderent sides of a drill embodying the invention; Fig. 3 represents a section on linev 3-3 of Fig. 1; Fig. 4 represents a section on line f-t of Fig. 3; Fig. 5 represents a side view of the driving member of the clutch hereinafter referred to; Fig. 6 represents an edge view of said driving member; Fig. 7 represents a section on line 7 7 of Fig. 1.

The same reference characters indicate the same or similar parts in all the views.

1n the drawings forming a part of this specification: 12 represents a portable frame which includes inner and outer cross bars 12l and 12b having bearings in which a spindle 13 is journaled. One end of the spindle is provided with a chuck 14; adapted to hold various sizes of drillbits or other tools. y

The frame carries a one-way clutch which includes a driving' member adapted to be 1 rotated forward and backward by a handoperated reciprocatory motor as hereinafter described, and a driven member connected by speed-multiplying connections with the spindle and locked to the driving member only when the latter is rotating forward, the driven member and the spindle being free to rotate forward while the driving member is rotating backward so that a continuous and practically uniform forward rotation may be imparted to the spindle by intermittent forward rotations of the driving member. The preferred construction of said clutch and the preferred connections between the driven member and the spindle areas follows: 15 represents the driving member, which is circular or discoidal and is adapted to be rotated in opposite directions by the said reciprocating motor, on a stud 16 attached to the frame 12. The periphery of the member 15 is out away to form one or more, and preferably three, flat faces 17 located between roller-retaining flanges 18 (Fig. 6). Y

19 represents the driven member which is formed as a sleeve having a cylindrical internal surface surrounding the periphery of the driving member 15, and a hub 20 (Fig. 3) adapted to rotate on the stud 16. The internal surface of the driven member 19 cooperates with the flat faces 17 on the driving member, in forming the sides of tapering chambers formed to contain clutch rollers 21. Said rollers are confined against endwise displacement by the flanges 18, as shown by Fig. 6, and bear loosely against stop pins or abutments 22 attached to the driving member 15. The arrangement is such that when the driving member is rotated forward, as indicated by the arrow (Fig. 4:), the rollers 21 are caused to move away from the abutments 22 andbind in the tapering chambers formed as above described, and thus lock the two members together so that the driven member is also rotated forward. When the driving member is rotated backward, as indicated by the arrow y (Fig. 4), the rollers are moved toward the abutments 22 and release the driven member, which. is therefore free to continue its forward rotation while the driving member is rotating backward, so that a practically continuous forward rotation is imparted to the driven member by j intermittent forwa'rd rotary movements of the Vdriving member;

.'-The `speed Vmultiplying connections .be-

' tweenthe driven member 19 and the spindle 5 13 comprise a relatively large bevel gear 25 formed on the member 19, and a relatively small bevel gear or pinion 26 formed on or attached tothe spindle and meshing with the gearv 25, as shown by F ig. 2. V The preferred motor for rotating Vthe driving `member 19 comprises a handle 27 .adaptedto be grasped by one hand :of the Y V.operatori'and'movable longitudinally on a Y .guide.rod1528 attached tothe frame 12 sub* is-,stantially in .alinementvvith the spindle 13,

Y 4th'eihandle being provided with a longituldinaleavity'29 receiving said rod, a spring ;30 =insaid cavity bearing againstithe rod -aiidnorm'a'lly raisingthehandle to the po- 2,0 sitionlshown by yFigsgl. and 2, and a bar k,31, having a shank-31a` attached by screws vr32-to1a .ferrulej33 onthe innerend of the fliandlesai'dbarbeing .providedwith teeth v34;, andviconstituting la rack, meshing with Y Y25 -affspur gearl Yattached'by pins BGto the Vdrlvingmember -15. Y i

tWhen the handle 27 and rack 31 are pressedfdownward by the voperator from the `positionvsh'own` by Figs; 1` and 2, V.the rack Borland, the pinion 85 .rotate the driving `member .'forward, and when the pressure is re- Qleased gthe spring 30 raises the handle and ',raclrzso that the driving member YVis rotated `backward f Y Y Y Y The 'rack is held in engagement with the ,pinion-Baby aY pin 39 attachedto'the frame vland-b'caring `on the back of .the rack.V Said .pincons'titutes -a AVguide .for lthe rackand a vspring 30 .and 4prevent separation of the vf'ra'me. and .guide-*rod Vrfrom theV handle, the =rack being .providedwith avstop `member 40 yarranged-ftoyabut against the pin'39, as indicatedby Figl. Y

stantially Vvlongitudinal alinement with the spindle A113 renders. the handle 2,7 and va fbit carried by the spindle substantially y' Y coaxial',so;that thejbit'is accurately guided The proand'i'controlled vr.by lthev zhandle. Y i Avision;ofvmeans,.suchiasgthe pin39 andstop 40, fo'r preventing separation of the .frame f andvguide :rod .from ythe handle, `renders kthe v bit `not. only rotatable,:but also dirigibleby 515 l one=hand1 of fthe operator. f

- f 4stop tolimit-the upward movement by the.

' T'V'The arrangementfofthe lguide rod-28 subis being pressed downward by the operator, but also while the handle is being raised by the spring, and the driving member is rotating backward.

To steady the forward 'rotation of the spindle and increase its momentum, I attach to the spindle a balance wheel 42 which is 1sufficiently heavy to accomplish these resu ts.

VThe frame 12 and spindle 13 are preferably provided with complemental bearing members constituting an anti'frictional thrust bearing sustaining end thrust on the -spindle due to contact of the bit with the Work. As here shown, said members include the cross-bar 12, a collar 13 attached to the spindle, and a circular series of small antifriction balls 44 interposed between said cross-bar and collar, as indicated by Fig. l. Said thrust bearing permits the spindle to rotate rapidly by eliminating friction due to .end thrust.

The improved drill is analogous to the V well known jewelers bow drill in that the bit-carrying spindle is rotated by a reciprocating handle, but differs from the bow drill in many respects and particularly in that the spindle is adapted to be rotated continuously in a forward direction by the reciprocation of the handle.

The clutch, and the gearing connecting its driven member with the spindle, consti- `tute a mechanism intermediate the spindle and the motor, adapted to, or having pi'ovisions for, imparting a continuous forward rotation from the reciprocating motor to the spindle.

As implied in the foregoing description and in the following claims,I am not limited to the specific mechanism of the preferred embodiment of my improvements shown by the drawings, except as otherwise required in certain of the more limited claims.

kHaving described my invention, I claim:

1. A drill comprising a portable frame, a rotary bit-carrying spindle carried by the frame, a handle substantially in alinement with the spindle and longitudinally movable relatively tothe frame and spindle, means being vprovided for guiding the handle and vfor limiting the longitudinal movements thereof, and mechanism coperating with the handle to rotate the spindle, the drill as a .whole beingdirigible and the bitfcarrying spindle rotatable by the handle.

` 2. Axdl'ill vcomprising aY portable frame 'having a guide rod, a rotary bit-carrying spindle carried by the frame, substantially in alinement with said` guide rod, a reciprovcatory handle movable longitudinally on the guide rod, and mechanism cooperating with Ythe handle Yto .impart a continuous yforward rotation to the spindle, means being provided lfor preventing separation of the frame and guide rod from the h'andle, so that a bit carried by Said spindle is dirigible and rotatable by one hand of the operator.

3. A drill comprising a portable frame having a guide rod, a rotary bit-carrying spindle carried by the frame, substantially in alinement with the guide rod, a reciprocatory handle movable longitudinally on the guide rod, and mechanism cooperating with the handle to impart a continuous forward rotation to the spindle, the frame and spindle being provided with complemental bearing members forming an antifrictional thrust bearing adapted to sustain end thrust of the handle, exerted through the frame, on the spindle.

4t. A drill comprising a portable frame having a guide rod, a rotary bit-carrying spindle carried by said frame, substantially in alinementI with the guide rod, a one-way clutch also carried by the frame and including a driving member rotatable forward and backward, a rotatable driven member and means locking the driven member to the driving member when the latter is rotated forward, the driven member being free to rotate forward when the driving member is rotated backward, a reciprocatory handle mounted to slide on said guide rod and movable manually in one direction, a spring adapted to move said handle in the opposite direction, a rack attached to and reciprocating with the handle, a spur gear i attached to said driving member and meshing with said rack, and connections between said driven member and the spindle, means being provided for preventing separation of the frame and guide rod from the handle, so that a bit carried by said spindle is dirigible by said handle and rotatable continuously by the handle and spring acting alternately.

5. A drill comprising a portable frame having a guide rod, a rotary bit-carrying spindle carried by said frame, substantially in alinement with the guide rod, and provided with a bevel pinion and a stud attached to the frame and extending substantially at right angles with the spindle, a driving clutch member rotatable forward and backward on said stud and provided with a Spur gear, a driven clutch member rotatable on the stud and formed as a sleeve surrounding the driving member, means locking the driven member to the driving member only when the latter is rotated forward, said sleeve having a bevel gear meshing with the said spindle pinion, a reciprocatory handle mounted to slide on said guide rod and manually movable in one direction, and a rack attached to the handle and meshing with said spur gear, means being provided for preventing separation of the frame and guide rod from the handle, so that the handle is adapted to direct a bit carried by the spindle and to coperate with the spring in imparting a continuous rotation to the bit.

6. A drill comprising a portable frame having a guide rod, a rotary bit-carrying spindle carried by said frame, a one-way clutch also carried by the frame and including a driving member rotatable forward and backward, a rotatable driven member and means locking the driven member to the driving member when the latter is rotated forward, the driven member being free to rotate forward when the driving member is rotated backward, a reciprocatory handle mounted to slide on said guide rod and mov able manually in one direction, a spring adapted to move said handle in the opposite direction, a rack attached to and reciprocating with the handle, a pinion attached to said driven member and meshing with said rack, and connections between said driven member and the spindle, the frame being provided with a fixed stop member with which the rack is in sliding Contact and the rack being provided with a complemental stop member which coperates with said fixed member in limiting the movement imparted to the rack and handle by the sprin In testimony whereof I have a Xed my signature.

JOHN A. LELAND.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, IJ. C. 

